Author
Topic: A Riddle (Read 10462 times)

Sebastian_Mares

You are alone in a house with three floors. In the third floor, there is a light bulb. In the basement, there are three switches. One switch turns the lamp in the third floor on and off while the other two switches have no function. You cannot see the third floor from the basement, nor can you see which of the three switches has a function. Your job is to find out which switch is responsible for the light bulb in the third floor. You are allowed to go upstairs only one time.

Turn on one switch. Wait a while (10min or so), then turn that switch off and turn another on, then quickly head to the third floor. If the light is on, then the second switch does it. If the light is off, then check if the bulb is warm. If so, the first switch controls it, otherwise, the third switch controls it.

Sebastian_Mares

Turn on one switch. Wait a while (10min or so), then turn that switch off and turn another on, then quickly head to the third floor. If the light is on, then the second switch does it. If the light is off, then check if the bulb is warm. If so, the first switch controls it, otherwise, the third switch controls it.